[lwip-users] lwip ftp speed becomes lower when plug cable again

[vincent cui]

Hi:

 

I develop a ftp server with lwIP tcp api,, now a problem blocks me a long time .

Normally, I get file from the ftp server by FlashFXP, the speed is up to 200kB/s.

but the speed becomes lower in following case:

1.       Unplug cable when getting file from the ftp server

2.       the transfer will process continually after plug cable again, then, the speed becomes 3KB/s

 

I trace the problem and find the value of tcp_sndbuf(pcb) is small enough…I guess it dues to slipping windows problem

 

Anyone meet the problem ?

 

Vincent Cui
Sr. Firmware Engineer
Mobile: +8613255150315
Tel: +86 21 34612525x6104
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Shanghai EnLogic Electric Technology Co., Ltd.
Address: 1104-1106, Building A, No.391, Guiping Road, Xuhui District, Shanghai, 200233